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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae21d9af93fe3068b2fc26957ea133713fe7533e387320d90373424f5aa9251e' 
  AND token = 'EPoslS/nlU+U35wEJKjlfN0aub42+3zCS3UWRwySanA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}